/*
 * Copyright (c) 2016, The National Archives <pronom@nationalarchives.gov.uk>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *  * Neither the name of the The National Archives nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package uk.gov.nationalarchives.droid.container;

import java.io.IOException;
import java.io.InputStream;

import uk.gov.nationalarchives.droid.core.IdentificationRequestByteReaderAdapter;
import uk.gov.nationalarchives.droid.core.interfaces.IdentificationRequest;
import uk.gov.nationalarchives.droid.core.interfaces.archive.IdentificationRequestFactory;
import uk.gov.nationalarchives.droid.core.signature.ByteReader;

/**
 *
 * @author rbrennan
 */
public abstract class AbstractIdentifierEngine implements IdentifierEngine<InputStream> {
    
    private IdentificationRequestFactory<InputStream> requestFactory;
    
    /**
     * Returns a ByteReader for the input stream supplied.
     * @param in an input stream
     * @return a Byte reader
     * @throws IOException if the input stream could not be read
     */
    protected ByteReader newByteReader(InputStream in) throws IOException {
        IdentificationRequest<InputStream> request = getRequestFactory().newRequest(null, null);
        request.open(in);
        return new IdentificationRequestByteReaderAdapter(request);
    }
    
     /**
     * @param requestFactory the requestFactory to set
     */
    public void setRequestFactory(IdentificationRequestFactory<InputStream> requestFactory) {
        this.requestFactory = requestFactory;
    }
    
    /**
     * @return the requestFactory
     */
    protected IdentificationRequestFactory<InputStream> getRequestFactory() {
        return requestFactory;
    }
}
